7. Keep a log

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So you fell off the wagon and ate that big bowl of ice cream or didn't go to the gym for five days straight. Get a piece of paper and a pen and write down what you did, why you are now royally pissed off at yourself and what you plan on doing in the immediate future to fix it. Friends often can't relate to personal weight problems, so a log is a good outlet for your frustration and allows you to come up with concrete solutions.